[IP] Meters Differ in readings

Why do all (3) of my meters (plasma) show a difference in the readings? I
have (3) One Touch Ultra's, bought within a short time of one another. They
read out as 150/190/210, with the same drop of blood, at the same time. There
is
a big difference in these numbers. I have used the solution that comes with
the Ultras but that does not do anything.
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